Yes I use it, but only for music (as theres not much else on there). It's ok if theres a popular song you want, and don't want to download the full album. I struggle to find rare songs, simply because not many people have them. Also, you can't be too fussy with bitrate, as its nearly always 128 CBR.
If you are just looking for a quick way to get some songs to stick on an mp3 player before a journey or something then its great. If you are planning on burning them to a CD for long term use, I would download from elsewhere.